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I'm not sure if I understand you correctly. What does the picture have to do with the game language? Are you mean the language that I use to write the picture file names?

Yes; Because I will use these language in my project:
1) English
2) Japanese
3) France
4)

See the red, what language is it?

I need to add in my project.

That is Portuguese from Brazil. It is like I said before, I believe you could use any language you want. 

But that plugin is not a language manager, is kinda a Font Manager. Regarding of this plugin there is a free version that you can test and see if it will work for your purposes.